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Question (41)

QN003741

Which device uses ultrasonic waves for underwater detection?

(A) Radar
(B) Microscope
(C) Sonar
(D) Periscope

Correct Answer: C

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Question (42)

QN003742

A sonar signal returns after 2 s in seawater. If speed of sound in seawater is 1500 m/s, depth of water is

(A) 750 m
(B) 1500 m
(C) 3000 m
(D) 6000 m

Correct Answer: B

Explanation:

Depth = (1500 × 2)/2 = 1500 m

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Question (43)

QN003743

Bats locate prey in darkness mainly by

(A) reflection of light
(B) magnetic fields
(C) echolocation
(D) infrared radiation

Correct Answer: C

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Question (44)

QN003744

Reflection of sound from a distant surface producing repetition of sound is called

(A) reverberation
(B) resonance
(C) diffraction
(D) echo

Correct Answer: D

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Question (45)

QN003745

Minimum distance required to hear a distinct echo in air is approximately

(A) 8.5 m
(B) 17 m
(C) 34 m
(D) 68 m

Correct Answer: B

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Question (46)

QN003746

A person hears an echo 0.4 s after shouting. Distance from reflecting surface is

(A) 34 m
(B) 68 m
(C) 136 m
(D) 170 m

Correct Answer: B

Explanation:

Distance = (340 × 0.4)/2 = 68 m

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Question (47)

QN003747

Persistence of sound due to repeated reflections in a hall is called

(A) diffraction
(B) interference
(C) reverberation
(D) refraction

Correct Answer: C

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Question (48)

QN003748

Reverberation can be reduced by using

(A) steel walls
(B) smooth marble
(C) curtains and upholstered chairs
(D) metallic sheets

Correct Answer: C

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Question (49)

QN003749

Sir C. V. Raman studied the acoustics of Indian instruments such as

(A) flute and guitar
(B) tabla and mridangam
(C) piano and violin
(D) trumpet and saxophone

Correct Answer: B

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Question (50)

QN003750

The black patch at the centre of tabla membrane is called

(A) tanpura
(B) octave
(C) syaahi
(D) timbre

Correct Answer: C

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Question (41)

Which device uses ultrasonic waves for underwater detection?

Explanation:

Link:

Question (42)

A sonar signal returns after 2 s in seawater. If speed of sound in seawater is 1500 m/s, depth of water is

Explanation:

Link:

Question (43)

Bats locate prey in darkness mainly by

Explanation:

Link:

Question (44)

Reflection of sound from a distant surface producing repetition of sound is called

Explanation:

Link:

Question (45)

Minimum distance required to hear a distinct echo in air is approximately

Explanation:

Link:

Question (46)

A person hears an echo 0.4 s after shouting. Distance from reflecting surface is

Explanation:

Link:

Question (47)

Persistence of sound due to repeated reflections in a hall is called

Explanation:

Link:

Question (48)

Reverberation can be reduced by using

Explanation:

Link:

Question (49)

Sir C. V. Raman studied the acoustics of Indian instruments such as

Explanation:

Link:

Question (50)

The black patch at the centre of tabla membrane is called

Explanation:

Link:

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